Question

Pipe a can fill in 20 min and b in 30 min and c in 40 min if all of them work together find the time taken to fill the tank

Answer 1

Answer:

9 3/13 mins

Step-by-step explanation:

Pipe A fills in 20mins - In one min, it fills 1/20

Pipe B fills in 30mins - In one min, it fills 1/30

Pipe C fils in 40mins - In one min, it fills 1/40

Together, the tank is filled 1/20+1/30+1/40=13/120 in 1min,

Total time required 1/(13/120) = 9 3/13 mins